fix(test): stabilize flaky network-dependent tests

[fengmk2]

Summary

• retry the complete HTTP body and JSON decode operation for npm metadata and the Node.js version index
• keep version classification and package-manager priority unit tests deterministic instead of reaching live registries
• allow the first Vite config evaluation more time on slow Windows CI workers

Validation

• cargo fmt --all -- --check
• cargo clippy -p vite_install -p vite_js_runtime -p vite_global_cli --all-targets -- -D warnings
• env -u NODE_OPTIONS RUST_MIN_STACK=8388608 cargo test -p vite_install -p vite_js_runtime --locked
• cargo test -p vite_global_cli test_classify_version --locked
• git diff --check

The focused TypeScript test requires generated Vite/Core/CLI build artifacts that are not present in a fresh worktree; CI will run it after the normal build setup.

[netlify]

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[fengmk2]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. 👍

Reviewed commit: bffcc19d27

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